str = '一月份二月份三月份四月份五月份六月份七月份八月份九月份十一月十二月'

m = int(input("请输入 1-12 的整数："))
if 1 <= m <= 12:
    pos_start = m + 2 * (m - 1) - 1
    month = str[pos_start:(pos_start + 3)]
    print(month)
else:
    print("Input error.")
